Re: [klibc] Exporting which partitions to md-configure

Kyle Moffett
2006-01-31T06:53:39Z

On Jan 30, 2006, at 22:24, Greg KH wrote:
> Oh, an example of it working:
> # vol_id /dev/sda3
> ID_FS_USAGE=filesystem
> ID_FS_TYPE=ext3
> ID_FS_VERSION=1.0
> ID_FS_UUID=9d2efd53-6b5a-4f84-86cc-def71269b7ca
> ID_FS_LABEL=
> ID_FS_LABEL_SAFE=
> # vol_id -t /dev/sda3
> ext3
> # vol_id -u /dev/sda3
> 9d2efd53-6b5a-4f84-86cc-def71269b7ca

That shows filesystem information, but not at all the partition table
information. If I look at my mac partition table (this is using the
apple-provided tool under OS X, but it's the same using the Linux
tool), for example:

hc6524e32:~ kyle$ sudo -H /usr/sbin/pdisk -l /dev/disk1

Partition map (with 512 byte blocks) on '/dev/disk1'
#: type name length
base ( size )
1: Apple_partition_map Apple 63 @ 1
2: Apple_Bootstrap bootstrap 1600 @ 64
3: Apple_UNIX_SVR2 linux_boot 1048576 @
1664 (512.0M)
4: Apple_UNIX_SVR2 linux_swap 2097152 @
1050240 ( 1.0G)
5: Apple_UNIX_SVR2 linux_lvm 241051200 @
3147392 (114.9G)
6: Apple_Boot eXternal booter 262144 @
244198592 (128.0M)
7: Apple_RAID Apple_RAID_OfflineV2_Untitled_2 243936432 @
244460736 (116.3G)

Device block size=512, Number of Blocks=488397168 (232.9G)
DeviceType=0x0, DeviceId=0x0

Now obviously linux_boot, linux_swap, and linux_lvm are not
_actually_ Apple_UNIX_SVR2, but that's the type stored in the
partition map. They also have partition map labels "linux_*", but
they do *not* have ext3 volume labels. In fact, linux_boot is one
slice of a RAID1 of 3 drives, linux_swap is one slice of a RAID5 of 3
drives, and linux_lvm is one slice of a RAID5 of 3 drives that
alltogether make an LVM PV. If I examine each of those partitions
individually, I get a lot of other information that is totally
unrelated to that stored in the partition table. It would be nice to
be able to change the type of linux_* from Apple_UNIX_SVR2 to
Linux_RAID (Max length is 31 characters), and have my userspace tools
be able to detect that and do useful things with it and the pmap label.

Cheers,
Kyle Moffett

--
If you don't believe that a case based on [nothing] could potentially
drag on in court for _years_, then you have no business playing with
the legal system at all.
-- Rob Landley